Ensure that hash for a symbol is not set to 0 when it is made external.

runtime/platform/assert.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef PLATFORM_ASSERT_H_
 #define PLATFORM_ASSERT_H_
 
 // TODO(5411406): include sstream for now, once we have a Utils::toString()
 // implemented for all the primitive types we can replace the usage of
 // sstream by Utils::toString()
@@ skipping 251 matching lines @@
 
 // In order to avoid variable unused warnings for code that only uses
 // a variable in an ASSERT or EXPECT, we make sure to use the macro
 // argument.
 #define ASSERT(condition) do {} while (false && (condition))
 
 #define DEBUG_ASSERT(cond)
 
 #endif  // if defined(DEBUG)
 
+#define RELEASE_ASSERT(cond)                                                   \
+  do {                                                                         \
+    if (!(cond)) dart::Assert(__FILE__, __LINE__).Fail("expected: %s", #cond); \
+  } while (false)
+
 
 // The COMPILE_ASSERT macro can be used to verify that a compile time
 // expression is true. For example, you could use it to verify the
 // size of a static array:
 //
 //   COMPILE_ASSERT(ARRAYSIZE(content_type_names) == CONTENT_NUM_TYPES);
 //
 // or to make sure a struct is smaller than a certain size:
 //
 //   COMPILE_ASSERT(sizeof(foo) < 128);
@@ skipping 61 matching lines @@
 
 #define FAIL1(format, p1)                                                      \
   dart::Expect(__FILE__, __LINE__).Fail(format, (p1))
 
 #define FAIL2(format, p1, p2)                                                  \
   dart::Expect(__FILE__, __LINE__).Fail(format, (p1), (p2))
 
 #endif  // defined(TESTING)
 
 #endif  // PLATFORM_ASSERT_H_